Stripping roll for long fiber feeders



: March 1945- W.'F. BOKUM 2,372,543

STRIPPING ROLL FOR LONG FIBER- FEEDERS -Filed Oct. 1, 1942 4Sheets-Sheet 1 Mal-ch27, 1945. w Q KUM' 2,372,543

\ I "STRHPING ROLL FOR LONG FIBER FEEDERS Filed Oct. 1, 1942 4Sheets-Sheet 2 March 27, 1945. w BOKUM 2,372,543

STRIPPING ROLL FOR LONG FIBER FEEDERS Filed Oct. 1, 1942 v f Sheets-Shee5 March 27, 1945. F BOKUM 2,372,543

STRIPPING ROLL FOR LZONG FIBER FEEDERS Filed Oct. 1, 1942 4 Sheets-Sheet4 Patented Mar. 27, 1945 William F. Bokum, Jenkintown, Pa assignor toProctor & Schwartz, Incorporated, Philadelphia, Pa... a corporation ofPennsylvania Application October 1, 1942, Serial No. 460,442

2 Claims.

This invention relates to apparatus for feeding fibrous stock togarnett, carding and other fiberworking machines. The present inventionrelates more particularly to devices for handling relatively long fiberssuch as sisal, ixtle, tampico, jute, flax, etc.

Fibrous stock is normally fed to carding and garnett machines by what iscommonly known in the art as a, weighing feeder. These feeders include ahopper, into which the stock is deposited intermittently by anattendant. Stock is removed from the hopper, in a more or lesscontinuous web, by a spike apron of the endless belt type, with one runof the apron moving upwardly at a steep incline, in one hand of thehopper, and against which the bulk of stock in the hopper is caused tobear.

The apron passes over an upper guide roll by which its direction ofmovement is reversed. Adjacent the upper end of the descending run ofthe apron, the feeder is provided with a wiping or stripping cylinderwhich rotates at a peripheral speed higher than the surface speed of thespike apron. A

The stripping cylinder is provided with rigidly mounted teeth which wipethe fibrous stock off the spikes n the descending run of the apron,delivering the stock into the scale pan of the weighing device whichforms a part of thefeeder.

The scale pan, in turn, intermittently drops weighed batches of thefibrous stock onto the feeding apron of th carding or garnett machine,as is well known in the art.

In handling the longer fibers difiiculty has been encountered inclearing the fibers off the rigidly mounted teeth of the strippingcylinder, which frequently results in the fibers becoming wound aboutthe cylinder and necessitating the shutting down of the unit until thecylinder can be cleaned by hand. This entails a loss of time and produration.

The object of the present invention is to provide a self-clearingstripping cylinder for wiping long fibers off the spike aprons ofautomatic weighing feeders and other fiber handling appa-- ratus.

in the accompanying drawings:

stripping cylinder as taken on the line 3-3, Fi

Fig. 4 is a transverse sectional elevation taken on the line 4-4, Fig.3;

Fig. 5 is a' transverse sectional view taken on the line 5-5, Fig.3;.and

Figs. 6 and '7 are detached perspective 'views of a detail of theinvention.

The weighing feeder shown in Fig. 1 is of the type shown and describedin the present assignees prior Patent No. 1,660,249, dated February 21,1928, to William F. Bokum, the present petitioner, modified inaccordance with the copending application of the aforesaid William F.Bokum and John W. Weber, Serial No. 427,668, filed January 21, 1942.

As shown in l, the eludes 9, hopper A, with a movable bottom a; a spikeapron B, having an ascending run 1: and a descending run 12 a verticallyoscillating evener comb C; a scale pan D; and a delivery conveyer E,which may constitute the feeding apron of a carding or garnett machineor which may deliver the weighed batches of fibrous stock onto thefeeding apron of such machine.

The weighing feeder also includes the stripping cylinder H] whichconstitutes the subject I matter of the present invention.

Fig. l is a sectional elevation, in phantom, of

an automatic weighing feeder provided with a self-clearing strippingcylinder constructed and operated in accordance with the principles ofthe present invention; v

Fig. 2 is an enlarged end view, partly in section,

of the stripping cylinder shown in Fig. 1;

Fig. 3 is a longitudinal sectional view of the The stripping cylinder inis mounted on a shaft ll, which in turn, is rotatably mounted at each ofits opposite ends in a self aligning bearing l2, preferably of the selflubricating or oilless type. Each bearing 42 includes a sleeve i3 havinga spherical center it mounted for universal movement in a socket bearingit which is rigidly secured to a suitable rigid portion l6 of theframeare formed inplanes tangent to a common circle concentric to theaxis of the shaft ii and hub, 58, although it will be understood thatthe guide slots 2i, 2i may be strictly radially disposed with respect tothe axis of the shaft H,- if desired,

The guide slots 21,2! of the various heads H are aligned one withanother longitudinally of weighing feeder inthe cylinder I0, for thereception of a series of retractable and extendable stripping bars 22,22.

Each of the stripping bars 22 is provided with a series of strippingpins or teeth 23, 23, which are spaced apartlongitudinally of andrigidly secured in said bars, said pins being provided with sharplypointed outer ends which are adapted to be projected and retractedthrough apertures 24,

24 formed in the outer shell or barrel 20 of the cylinder l0.

As shown more particularly in Fig. 4, diametrically opposite pin bars22, 22, are rigidly connected in the form of a rigid frame by tie yokes25, 25, whereby, as the pins on one side of the cylinder Ill areprojected to wipe the fibrous stock off the spikes of the spike apron,the pins on the m a slide 26, canted at an angle to the plane of thebar, as shown in Fig. 2. Each slide26 is slidably mounted in a guideway21 formed on the outside of an eccentric strap ring 28.

flhe eccentric strap rings 28, at the opposite "ends respectively of thecylinder It, are rotatably mounted on fixed eccentrics 29. Eacheccentric 29 is provided with a neck 30 which encircles the shaft H,with operating clearance therebetween. Each neck 30 is provided with aflange 3! which is adjustably clamped against the rear face of theadjacent bearing block it for the shaft ii, as clearly shown in Figs. 3and 5.

As shown in Fig. 5, the flanges 3i for the eccentrics 29, are providedwith a series of concentric elongated segmental slots 32 for thereception of cap screws 33, 33, tapped into the bearing blocks l5.

By adjusting the eccentrics 29 about the axis of the shaft H, the pointof retraction for the pins 23 may be accurately determined for causingthe fibers to drop freely into the scale pan of the weighing feeder.

The opposite ends of the cylinder Hi are respectively closed by discs 34which are secured to the end heads I! by screws 35 tapped into bosses 35formed on the heads ii. The peripheral edges of the discs 34 arepreferably seated in annular shouldered recesses 31 formed in theflanges id of the end heads ill.

The outer shell or barrel 20 is formed of segmental plates 38, 38,having adjacent edges overlapping, as shown. at 39 in Fig. 2, withcounterslightly in excess of the surface-speed of the spike apron, thepin-teeth 23 will be projected beyond the shell 20, as each set of pinsapproaches the descending portion of the apron, and will be retracted asthe pin bars 22 successively approach straps 28 revolving about thefixed eccentrics 29, and with the diametrically opposite pin bars 22, 22tied together by the yokes '25 to keep the slides, guides and eccentricstraps at all times in free cooperating relation to each other.

By adjusting the eccentrics 29 about the shaft H, the point ofretraction of the pins 23 and the consequent dropping of the fibrousstock off the cylinder l0 into the scale pan of the feeder may beaccurately controlled.

As shown in Figs. 1, 2, and 4, the rows of pins 22 are respectivelyarranged with the axes of the pins of each row in a plane tangent to acommon circle concentric to the axis of rotation of the shell of thestripping cylinder Ill, which causes the pins, when projected beyond theperipheral surface of said shell, to be disposed at acute angles tothose portions of the shell surface immediately adjacent and precedingthe respective rows of pins in the direction of rotation of the shell,whereby the pins assume the form of hooks for more efliciently grippingthe fibers.

As shown in Figs. 2 and 4, the pins are retracted by being moved axiallyin the above noted planes which eliminates the possibility of the fibersbeing pinched between the pins and the shell surface during suchretraction of the pins, whereby the fibers are fully released anddropped clear of the cylinder without clinging thereto and withoutbreaking the fibers.

I claim:

1. A rotary stripping cylinder for fiber handling apparatus, comprisinga shell, a shaft coaxial with said shell, heads spaced along said shaftwithin said shell, a series of pin bars paralleling said shaft andslidably mounted for lateral movement relative thereto in guides formedin said heads in planes tangent to a common circle concentric to theaxis of rotation of the shell, a series of pins spaced along each bar,an eccentric encircling said shaft "at each end of said cylinder, aneccentric strap encircling each, eccentric, a slide on each end of eachbar, and aguideway on each eccentric strap for each slide for effectingprojection and retraction of said pins through openings in said shellupon relative rotation between said cylinder and said eccentrics, eachpin when projected being disposed at an acute angle to that portion ofthe surface of the shell preceding the pin in the direction of rotationof the shell.

2. A rotary stripping cylinder for fiber handling apparatus, comprisinga shell, a shaft coaxial with said shell, heads spaced along said shaftwithin said shell, 2. series ofpin bars paralleling said shaft andslidably mounted for lateral movement relative thereto in guides formedin said heads in planes tangent to a common circle concentric to theaxis of rotation of the shell, a series of pins spaced along each bar,an eccentric encircling said shaft at each end of said cylinder, aneccentric strap encircling each eccentric, a slide on each end of eachbar, a guideway on each eccentric strap for each slide, and yokesconnecting diametrically opposite pairs of said bars for effectingprojection and retraction of said pins through openings in said shell,upon relative rotation between said cylinder and said eccentrics, eachpin when projected being disposed at an acute angle theunder side of thecylinder ill by the slides 26 riding in the guideways 21 and theeccentric to that portion of the surface of the shell preceding the pinin the direction of rotation of the shell. I

